IFNG and Ewing sarcoma: Primary human NK cells were used to verify the specific IFN-γ production in response to non-transduced or hu-IL-12 transduced Ewing sarcoma in varied effector to target ratios (10:1, p = 0.000006; 5:1, p = 0.009510; and 1:1, p = 0.000125) and supernatant (p = 0.0029) (Fig. 2d).